Rebuilding an old Horse 6hp, need some help

[jrmcgove]

Hello, I'm rebuilding an old Horse model Troy Bilt. I'm guessing mid 70's. I have a couple of questions and may have more as I go. I'm starting to put it back together and I have a few snags.

First, I have the gears back in the transmission and I was moving fast/slow selector back and forth to make sure it operates correctly. It seams that both gears are locked to the axle all the time. I'm wondering if I have the axle bushings in to far and they are holding the gears together so they are both locked. I put the bushings in so that they are flush with outside of transmission housing, which means they stick into the inside of the housing approximately an 1/8 inch.

Second, need to resolve first issue first but this popped into mind for the next step. How far into the transmission housing do the bearing races for the main drive shaft need to be set into the housing. There doesn't appear to be a spot where they would seat into, it looks like I could press them in one side and right out the other. Are there some measurements/specifications for putting these back togehter?

Thank you.

 

[BCSSHOP]

Hello jrmcgove.

Both the low speed and the high speed gears are free spinning on the wheel shaft. The center speed selector is the only thing keyed onto the axle. This selector slides left and right to select which speed is driving the axle. To keep the high and low speed gears from both connecting the speed selector at the same there are three pins about 3" long in the speed selector to allow only one gear to be engaged at the same time. If these pins are left out the whole gear cluster with the speed selector will be very loose and bad things can happen.

The bushings should driven in until they are seated all the way in the casting and as you observe they protrude an 1/8"to 3/16" inside the transmission casting. The gears and speed selector should have little end play between the bushings. Now shim the wheel shaft using the wheel shims to achieve less than .010" end play in the axle when the snap rings are installed, This can be a pain but it is important. More than .010" end play will let the snap rings to be knocked out on rough ground causing the axle to slide back and forth and push out the oil seal.

I haven't rebuilt a TroyBilt transmission in 15 years but once you have done a few its like riding a bicycle!

 

[jrmcgove]

Thank you, after looking at it again and messing around with it. I realized the gear selector is fine. Not sure if I have less than .010" play in axle though. There isn't much play but .010 seems pretty tight, so I probably have more than that.